202045021 has 2 divisors, whose sum is σ = 202045022. Its totient is φ = 202045020.

The previous prime is 202045013. The next prime is 202045033. The reversal of 202045021 is 120540202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202037796 + 7225 = 14214^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 202045021 - 2³ = 202045013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202044986 and 202045004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202045091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101022510 + 101022511.

It is an arithmetic number, because the mean of its divisors is an integer number (101022511).

Almost surely, 2^202045021 is an apocalyptic number.

It is an amenable number.

202045021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202045021 is an equidigital number, since it uses as much as digits as its factorization.

202045021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 202045021 is about 14214.2541485651. The cubic root of 202045021 is about 586.7900182185.

Adding to 202045021 its reverse (120540202), we get a palindrome (322585223).

The spelling of 202045021 in words is "two hundred two million, forty-five thousand, twenty-one".